
#include "crypt/aes.h"

AES::AES(unsigned char* key)
{
    unsigned char sBox[]       =
                          { /*  0    1    2    3    4    5    6    7    8    9    a    b    c    d    e    f */
                                  0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7,
                                  0xab,
                                  0x76, /*0*/
                                  0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4,
                                  0x72,
                                  0xc0, /*1*/
                                  0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8,
                                  0x31,
                                  0x15, /*2*/
                                  0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27,
                                  0xb2,
                                  0x75, /*3*/
                                  0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3,
                                  0x2f,
                                  0x84, /*4*/
                                  0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c,
                                  0x58,
                                  0xcf, /*5*/
                                  0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c,
                                  0x9f,
                                  0xa8, /*6*/
                                  0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff,
                                  0xf3,
                                  0xd2, /*7*/
                                  0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d,
                                  0x19,
                                  0x73, /*8*/
                                  0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e,
                                  0x0b,
                                  0xdb, /*9*/
                                  0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95,
                                  0xe4,
                                  0x79, /*a*/
                                  0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a,
                                  0xae,
                                  0x08, /*b*/
                                  0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd,
                                  0x8b,
                                  0x8a, /*c*/
                                  0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1,
                                  0x1d,
                                  0x9e, /*d*/
                                  0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55,
                                  0x28,
                                  0xdf, /*e*/
                                  0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54,
                                  0xbb,
                                  0x16  /*f*/
                          };
    unsigned char invsBox[256] =
                          { /*  0    1    2    3    4    5    6    7    8    9    a    b    c    d    e    f  */
                                  0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3,
                                  0xd7,
                                  0xfb, /*0*/
                                  0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde,
                                  0xe9,
                                  0xcb, /*1*/
                                  0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa,
                                  0xc3,
                                  0x4e, /*2*/
                                  0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b,
                                  0xd1,
                                  0x25, /*3*/
                                  0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65,
                                  0xb6,
                                  0x92, /*4*/
                                  0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d,
                                  0x9d,
                                  0x84, /*5*/
                                  0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3,
                                  0x45,
                                  0x06, /*6*/
                                  0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13,
                                  0x8a,
                                  0x6b, /*7*/
                                  0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4,
                                  0xe6,
                                  0x73, /*8*/
                                  0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75,
                                  0xdf,
                                  0x6e, /*9*/
                                  0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18,
                                  0xbe,
                                  0x1b, /*a*/
                                  0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd,
                                  0x5a,
                                  0xf4, /*b*/
                                  0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80,
                                  0xec,
                                  0x5f, /*c*/
                                  0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9,
                                  0x9c,
                                  0xef, /*d*/
                                  0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53,
                                  0x99,
                                  0x61, /*e*/
                                  0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21,
                                  0x0c,
                                  0x7d  /*f*/
                          };
    memcpy(Sbox, sBox, 256);
    memcpy(InvSbox, invsBox, 256);
    KeyExpansion(key, w);
}

AES::~AES()
{

}

void AES::Cipher(char* input, char* output)
{
    unsigned char uch_input[1024];
    strToUChar(input, uch_input);
    Cipher(uch_input);
    ucharToHex(uch_input, output);
}

void AES::InvCipher(char* input, char* output)
{
    unsigned char uch_input[1024];
    hexToUChar(input, uch_input);
    InvCipher(uch_input);
    ucharToStr(uch_input, output);
}

unsigned char* AES::Cipher(unsigned char* input)
{
    unsigned char state[4][4];
    int           i, r, c;

    for (r = 0; r<4; r++)
    {
        for (c = 0; c<4; c++)
        {
            state[r][c] = input[c*4+r];
        }
    }

    AddRoundKey(state, w[0]);

    for (i = 1; i<=10; i++)
    {
        SubBytes(state);
        ShiftRows(state);
        if (i!=10)MixColumns(state);
        AddRoundKey(state, w[i]);
    }

    for (r = 0; r<4; r++)
    {
        for (c = 0; c<4; c++)
        {
            input[c*4+r] = state[r][c];
        }
    }

    return input;
}

unsigned char* AES::InvCipher(unsigned char* input)
{
    unsigned char state[4][4];
    int           i, r, c;

    for (r = 0; r<4; r++)
    {
        for (c = 0; c<4; c++)
        {
            state[r][c] = input[c*4+r];
        }
    }

    AddRoundKey(state, w[10]);
    for (i = 9; i>=0; i--)
    {
        InvShiftRows(state);
        InvSubBytes(state);
        AddRoundKey(state, w[i]);
        if (i)
        {
            InvMixColumns(state);
        }
    }

    for (r = 0; r<4; r++)
    {
        for (c = 0; c<4; c++)
        {
            input[c*4+r] = state[r][c];
        }
    }

    return input;
}

void* AES::Cipher(void* input, int length)
{
    unsigned char* in = (unsigned char*) input;
    int i;
    if (!length)
    {
        while (*(in+length++));
        in = (unsigned char*) input;
    }
    for (i            = 0; i<length; i += 16)
    {
        Cipher(in+i);
    }
    return input;
}

void* AES::InvCipher(void* input, int length)
{
    unsigned char* in = (unsigned char*) input;
    int i;
    for (i = 0; i<length; i += 16)
    {
        InvCipher(in+i);
    }
    return input;
}

void AES::KeyExpansion(unsigned char* key, unsigned char w[][4][4])
{
    int           i, j, r, c;
    unsigned char rc[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};
    for (r = 0; r<4; r++)
    {
        for (c = 0; c<4; c++)
        {
            w[0][r][c] = key[r+c*4];
        }
    }
    for (i = 1; i<=10; i++)
    {
        for (j = 0; j<4; j++)
        {
            unsigned char t[4];
            for (r = 0; r<4; r++)
            {
                t[r] = j ? w[i][r][j-1] : w[i-1][r][3];
            }
            if (j==0)
            {
                unsigned char temp = t[0];
                for (r = 0; r<3; r++)
                {
                    t[r] = Sbox[t[(r+1)%4]];
                }
                t[3]   = Sbox[temp];
                t[0] ^= rc[i-1];
            }
            for (r = 0; r<4; r++)
            {
                w[i][r][j] = w[i-1][r][j] ^ t[r];
            }
        }
    }
}

unsigned char AES::FFmul(unsigned char a, unsigned char b)
{
    unsigned char bw[4];
    unsigned char res = 0;
    int           i;
    bw[0] = b;
    for (i = 1; i<4; i++)
    {
        bw[i] = bw[i-1] << 1;
        if (bw[i-1] & 0x80)
        {
            bw[i] ^= 0x1b;
        }
    }
    for (i = 0; i<4; i++)
    {
        if ((a >> i) & 0x01)
        {
            res ^= bw[i];
        }
    }
    return res;
}

void AES::SubBytes(unsigned char state[][4])
{
    int r, c;
    for (r = 0; r<4; r++)
    {
        for (c = 0; c<4; c++)
        {
            state[r][c] = Sbox[state[r][c]];
        }
    }
}

void AES::ShiftRows(unsigned char state[][4])
{
    unsigned char t[4];
    int           r, c;
    for (r = 1; r<4; r++)
    {
        for (c = 0; c<4; c++)
        {
            t[c] = state[r][(c+r)%4];
        }
        for (c = 0; c<4; c++)
        {
            state[r][c] = t[c];
        }
    }
}

void AES::MixColumns(unsigned char state[][4])
{
    unsigned char t[4];
    int           r, c;
    for (c = 0; c<4; c++)
    {
        for (r = 0; r<4; r++)
        {
            t[r] = state[r][c];
        }
        for (r = 0; r<4; r++)
        {
            state[r][c] = FFmul(0x02, t[r])
                    ^ FFmul(0x03, t[(r+1)%4])
                    ^ FFmul(0x01, t[(r+2)%4])
                    ^ FFmul(0x01, t[(r+3)%4]);
        }
    }
}

void AES::AddRoundKey(unsigned char state[][4], unsigned char k[][4])
{
    int r, c;
    for (c = 0; c<4; c++)
    {
        for (r = 0; r<4; r++)
        {
            state[r][c] ^= k[r][c];
        }
    }
}

void AES::InvSubBytes(unsigned char state[][4])
{
    int r, c;
    for (r = 0; r<4; r++)
    {
        for (c = 0; c<4; c++)
        {
            state[r][c] = InvSbox[state[r][c]];
        }
    }
}

void AES::InvShiftRows(unsigned char state[][4])
{
    unsigned char t[4];
    int           r, c;
    for (r = 1; r<4; r++)
    {
        for (c = 0; c<4; c++)
        {
            t[c] = state[r][(c-r+4)%4];
        }
        for (c = 0; c<4; c++)
        {
            state[r][c] = t[c];
        }
    }
}

void AES::InvMixColumns(unsigned char state[][4])
{
    unsigned char t[4];
    int           r, c;
    for (c = 0; c<4; c++)
    {
        for (r = 0; r<4; r++)
        {
            t[r] = state[r][c];
        }
        for (r = 0; r<4; r++)
        {
            state[r][c] = FFmul(0x0e, t[r])
                    ^ FFmul(0x0b, t[(r+1)%4])
                    ^ FFmul(0x0d, t[(r+2)%4])
                    ^ FFmul(0x09, t[(r+3)%4]);
        }
    }
}

int AES::getUCharLen(const unsigned char* uch)
{
    int len = 0;
    while (*uch++)
        ++len;

    return len;
}

int AES::ucharToHex(const unsigned char* uch, char* hex)
{
    int high, low;
    int tmp = 0;
    if (uch==NULL || hex==NULL)
    {
        return -1;
    }

    if (getUCharLen(uch)==0)
    {
        return -2;
    }

    while (*uch)
    {
        tmp  = (int) *uch;
        high = tmp >> 4;
        low  = tmp & 15;
        *hex++ = valueToHexCh(high); //先写高字节
        *hex++ = valueToHexCh(low); //其次写低字节
        uch++;
    }
    *hex    = '\0';
    return 0;
}

int AES::hexToUChar(const char* hex, unsigned char* uch)
{
    int high, low;
    int tmp = 0;
    if (hex==NULL || uch==NULL)
    {
        return -1;
    }

    if (strlen(hex)%2==1)
    {
        return -2;
    }

    while (*hex)
    {
        high = ascillToValue(*hex);
        if (high<0)
        {
            *uch = '\0';
            return -3;
        }
        hex++; //指针移动到下一个字符上
        low = ascillToValue(*hex);
        if (low<0)
        {
            *uch = '\0';
            return -3;
        }
        tmp = (high << 4)+low;
        *uch++ = tmp;
        hex++;
    }
    *uch    = (int) '\0';
    return 0;
}

int AES::strToUChar(const char* ch, unsigned char* uch)
{
    int tmp = 0;
    if (ch==NULL || uch==NULL)
        return -1;
    if (strlen(ch)==0)
        return -2;

    while (*ch)
    {
        tmp = (int) *ch;
        *uch++ = tmp;
        ch++;
    }
    *uch    = (int) '\0';
    return 0;
}

int AES::ucharToStr(const unsigned char* uch, char* ch)
{
    int tmp = 0;
    if (uch==NULL || ch==NULL)
        return -1;

    while (*uch)
    {
        tmp = (int) *uch;
        *ch++ = (char) tmp;
        uch++;
    }
    *ch     = '\0';

    return 0;
}

int AES::strToHex(const char* ch, char* hex)
{
    int high, low;
    int tmp = 0;
    if (ch==NULL || hex==NULL)
    {
        return -1;
    }

    if (strlen(ch)==0)
    {
        return -2;
    }

    while (*ch)
    {
        tmp  = (int) *ch;
        high = tmp >> 4;
        low  = tmp & 15;
        *hex++ = valueToHexCh(high); //先写高字节
        *hex++ = valueToHexCh(low); //其次写低字节
        ch++;
    }
    *hex    = '\0';
    return 0;
}

int AES::hexToStr(const char* hex, char* ch)
{
    int high, low;
    int tmp = 0;
    if (hex==NULL || ch==NULL)
    {
        return -1;
    }

    if (strlen(hex)%2==1)
    {
        return -2;
    }

    while (*hex)
    {
        high = ascillToValue(*hex);
        if (high<0)
        {
            *ch = '\0';
            return -3;
        }
        hex++; //指针移动到下一个字符上
        low = ascillToValue(*hex);
        if (low<0)
        {
            *ch = '\0';
            return -3;
        }
        tmp = (high << 4)+low;
        *ch++ = (char) tmp;
        hex++;
    }
    *ch     = '\0';
    return 0;
}

int AES::ascillToValue(const char ch)
{
    int result = 0;
    //获取16进制的高字节位数据
    if (ch>='0' && ch<='9')
    {
        result = (int) (ch-'0');
    }
    else if (ch>='a' && ch<='z')
    {
        result = (int) (ch-'a')+10;
    }
    else if (ch>='A' && ch<='Z')
    {
        result = (int) (ch-'A')+10;
    }
    else
    {
        result = -1;
    }
    return result;
}

char AES::valueToHexCh(const int value)
{
    char result = '\0';
    if (value>=0 && value<=9)
    {
        result = (char) (value+48); //48为ascii编码的‘0’字符编码值
    }
    else if (value>=10 && value<=15)
    {
        result = (char) (value-10+65); //减去10则找出其在16进制的偏移量，65为ascii的'A'的字符编码值
    }
    else
    { ;
    }

    return result;
}

